
The main enemy of helicopters flying 500 feet or below in altitude are what is referred as B1RDs, birds. Depending on the size of the B1RD it can take out a helicopters tail rotor, or even break through the windshield.
One grey day during the migration of ducks in South Louisiana I was flying solo to pick up some passengers in the west Delta area of the Gulf of Mexico, when suddenly appeared a large flock of duck in front of me. As I was trying to steer clear clear of then, I heard a loud CRASH. Pieces of plexiglass where hitting my left side. I looked to my left and in the seat next to me, there was a dead duck (no pun intended). Feathers where everywhere with the cold winter wind rushing through the large whole in the windshield. I counted my blessings that he came in through the other side and not on my side. If the duck had. you would not be reading this story.
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